<template>
   <div>
     <!-- 面包屑导航区域 -->
     <el-breadcrumb separator-class="el-icon-arrow-right">
       <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
       <el-breadcrumb-item>权限管理</el-breadcrumb-item>
       <el-breadcrumb-item>角色列表</el-breadcrumb-item>
     </el-breadcrumb>
     <!-- 卡片视图 -->
     <el-card>
       <el-col>
         <el-button type="primary">添加角色</el-button>
       </el-col>
       <!-- 角色列表区域 -->
       <el-table :data="rolelist" border stripe>
         <el-table-column type="expand">
           <template slot-scope="scope">
             <el-row :class="['bdbottom ',i1 == 0 ? 'dbtop':'','vcenter']" v-for="(item1,i1) in scope.row.children" :key="item1.id">
               <!-- 渲染一级权限 -->
               <el-col :span="5">
                 <el-tag  closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                 <i class="el-icon-caret-right"></i>
               </el-col>
               <!-- 渲染二级和三级权限 -->
               <el-col :span="19">
               <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                 <el-col :span="6">
                   <el-tag type="success"  closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                   <i class="el-icon-caret-right"></i>
                 </el-col>

                 <el-col :span="18">
                   <el-tag type="warning"  v-for="(item3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row,item3.id)">{{item3.authName}}</el-tag>
                   <i class="el-icon-caret-right"></i>
                 </el-col>
               </el-row>
               </el-col>
             </el-row>
           </template>
         </el-table-column>
         <!-- 索引列 -->
         <el-table-column type="index"></el-table-column>
         <el-table-column label="角色名称" prop="roleName"></el-table-column>
         <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
         <el-table-column label="操作" width="300px">
           <template slot-scope="scope">
             <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
             <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
             <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
           </template>
         </el-table-column>
       </el-table>
     </el-card>
     <!-- 分配权限的对话框 -->
     <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
       <!-- 树形控件 -->
       <el-tree :data="rightsList" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
       <span slot="footer" class="dialog-footer" >
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
     </el-dialog>
   </div>
</template>

<script>
export default {
  data () {
    return {
      rolelist: [],
      setRightDialogVisible: false,
      rightsList: [],
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      defKeys: [],
      roleId: ''
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    // 获取列表数据
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败！')
      }
      this.rolelist = res.data
      console.log(this.rolelist)
    },
    // 根据Id删除对应的权限
    async removeRightById (role, rightId) {
      // 弹框提示用户是否要删除
      const confirmResult = await this.$confirm(
        '此操作将永久删除该文件, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除！')
      }
      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败！')
      }
      role.children = res.data
    },
    async showSetRightDialog (role) {
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败！')
      }
      this.rightsList = res.data
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取角色下所有三级权限的id，并保存到 defKeys 数组中
    getLeafKeys (node, arr) {
      // 如果当前 node 节点不包含 children 属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item => this.getLeafKeys(item, arr))
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed () {
      this.defKeys = []
    },
    async allotRights () {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]

      const idStr = keys.join(',')

      const { data: res } = await this.$http.post(
        `roles/${this.roleId}/rights`,
        { rids: idStr }
      )

      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败！')
      }

      this.$message.success('分配权限成功！')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
  .el-tag {
    margin: 7px;
  }

  .bdtop {
    border-top: 1px solid #eee;
  }

  .bdbottom {
    border-bottom: 1px solid #eee;
  }

  .vcenter {
    display: flex;
    align-items: center;
  }
</style>
